Exam 1 review

Question 0

What is a oblique ridge?

Answer 0

It is a special kind of transverse ridge. The union of a triangular ridge and cusp ridge on the opposite side of tooth.
- Not PURE transverse ridges because both ridges are NOT triangular ridges

Question 1

What is a sulcus?

Answer 1

A depression or valley or space on the surface of a tooth between two ridges and/or cusps of which the inclines meet at an angle.
- It is NOT a groove. The groove is found at the bottom of the sulcus

Question 2

First evidence of calcification has occurred by how many weeks in utero?

Answer 2

By 20 weeks

Question 3

What tooth is the last primary tooth to begin calcification and when does it occur?

Answer 3

Primary Maxillary second molar (Tooth A, J)

This occurs at 19 weeks in utero

Question 4

Which primary tooth is the last to exfoliate? When does this occur?

Answer 4

Primary maxillary second molar. This occurs at 11 years. This tooth is replaced by the permanent maxillary second premolar

Question 5

Which are the first permanent teeth to erupt? When does this occur?

Answer 5

Maxillary and Mandibular 1st Molar

Occurs at 6 years

Question 6

Which teeth have the first permanent roots to completely form? And when does this occur?

Answer 6

Maxillary 1st molar, Mandibular Central Incisor, & Mandibular 1st molar
This occurs at 9 years

Question 7

By what age have permanent incisor tooth roots completely formed?

Answer 7

By 11 years of age

Question 8

What are the proximal contact areas in mandibular anterior teeth?
- Midline, Distal of central, mesial of lateral, distal of lateral, mesial of canine, distal of canine

Answer 8

Midline: Incisal third
Distal of Central: Incisal third
Mesial of Lateral: Incisal third
Distal of Lateral: Incisal third
Mesial of Canine: Incisal third
Distal of Canine: Middle third

Question 9

What is the Tuberculum Intermedium and in what two places can it be exhibited?

Answer 9

Exhibited only on Permanent mandibular molars
- Is considered an overdevelopment of either the distal cusp ridge of the mesiolingual cusp or the mesial cusp ridge of the distolingual cusp

Question 10

At what point is the anterior proximal contact most incisal?

Answer 10

Most incisal at the midline

Question 11

Height of Contour: Mandibular arch

What is the height of all facial surfaces and what third is it located?

Answer 11

0.5 mm located in the cervical third

Question 12

Height of Contour: Mandibular arch

What is the height of the mandibular anterior teeth on the lingual surface and what third is it located?

Answer 12

0.5 mm located in the cervical third

Question 13

Height of Contour: Mandibular arch

What is the height of the mandibular first premolar teeth on the lingual surface and what third is it located?

Answer 13

0.5 mm located in the middle third

Question 14

Height of Contour: Mandibular arch

What is the height of the mandibular 2nd premolar teeth on the lingual surface and what third is it located?

Answer 14

0.75 mm located in the middle third

Question 16

Height of Contour: Mandibular arch

What is the height of the mandibular molar teeth on the lingual surface and what third is it located?

Answer 16

1 mm located in the middle third

Question 17

Which primary teeth are the first to begin calcification and when does this occur?

Answer 17

Maxillary and Mandibular central incisors

- Occurs at 14 weeks in utero

Question 18

Which primary teeth are the first to exfoliate and when does this occur?

Answer 18

Maxillary and mandibular central incisors

- Occurs at 6.5 years

Question 19

What is the ideal plane of occlusion?

Answer 19

The ideal plane is not flat.

• A curved plane permits maximum use of tooth contacts during function
• The proper plane of occlusion will permit simultaneous functional contacts to occur in controlled areas of the dental arch

Question 20

Why is a flat plane not good for occlusion?

Answer 20

A flat plane allows for too many contacts on most posterior teeth on both sides of the mouth.

Question 21

What are oblique fibers useful for as a periodontal fiber?

Answer 21

Oblique fibers are known to resist forceful impaction of a tooth into the alveolus, consistent with many types of trauma.

Question 22

What are transseptal fibers helpful for?

Answer 22

Transseptal fibers help to maintain contiguous proximal contact

Question 23

Can an embrasure space exist even in situations when there is a diastema between proximal contact?

Answer 23

Yes. It is not necessary for the adjoining teeth to physically touch each other in order for the embrasures to be exhibited

Question 24

How many embrasures are produced in an ideal embrasure?

Answer 24

In an ideal embrasure construct, every contact area produces four embrasures that are continuous and contiguous with each other.

Question 25

T or F, Lingual embrasures on the maxillary first molar are larger than their respective facial embrasures because the crown tapers to the facial

Answer 25

False, They are smaller

Question 26

Is the primary crown enamel thinner or thicker than a permanent crown?

Answer 26

Thinner and has consistent depth

Question 27

Is the dentin thicker or thinner in permanent teeth compared to a primary tooth?

Answer 27

The dentin thickness is thicker in permanent and thinner in primary teeth

Question 28

Are the pulp chambers larger or smaller in proportion to the respective size of the tooth in primary teeth compared to permanent teeth?

Answer 28

Primary teeth have pulp horns that are high and the pulp chambers are proportionately larger

Question 29

Do the pulp horns in primary teeth extend taller than permanent molars?

Answer 29

Yes, primary pulp horns protrude higher underneath crown heights because their dentin thickness is minimal, compared to permanent teeth

Question 30

Explain the incisal ridge in the primary maxillary lateral incisor

Answer 30

It is curved toward the facial surface

Question 31

Which cusp is more prominent from the lingual view on the primary maxillary first molar?

Answer 31

The mesiolingual cusp is more prominent on the lingual surface than the distolingual cusp. The distolingual cusp, if visible, is SMALL

Question 32

Which cusp is larger and taller on the primary mandibular first molar?

Answer 32

The mesiofacial cusp is larger and taller than the distofacial cusp